public class Steamer {
    double load;
    double displacement;
    double speed;

    public Steamer(double load,double displacement,double speed){
        this.load=load;
        this.displacement=displacement;
        this.speed=speed;
    }
   public String sail(){
        return "今日天气晴朗，轮船起航";

    }
    public String whistle(){
        return "轮船开始鸣笛";

    }
    public String stop(){
        return "轮船停在岸边，风和日丽";
    }
}
